linux-kernel - Re: [patch] add kdump_after

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Date:	Tue, 21 Aug 2007 16:45:02 +0900
From:	Takenori Nagano <t-nagano@...jp.nec.com>
To:	vgoyal@...ibm.com
CC:	Keith Owens <kaos@....com.au>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	k-miyoshi@...jp.nec.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bernhard Walle <bwalle@...e.de>
Subject: Re: [patch] add kdump_after_notifier

Vivek Goyal wrote:
> On Thu, Aug 16, 2007 at 06:26:35PM +0900, Takenori Nagano wrote:
>> Vivek Goyal wrote:
>>  > So for the time being I think we can put RAS tools on die notifier list
>>> and if it runs into issues we can always think of creating a separate list.
>>>
>>> Few things come to mind.
>>>
>>> - Why there is a separate panic_notifier_list? Can't it be merged with
>>>   die_chain? die_val already got one of the event type as PANIC. If there
>>>   are no specific reasons then we should merge the two lists. Registering
>>>   RAS tools on a single list is easier.
>> I think it is difficult, because die_chain is defined by each architecture.
>>
> 
> I think die_chain is arch independent definition (kernel/die_notifier.c)? 
> But anyway, to begin with it can be done only for panic_notifier.

I think die_val (notify_die() argument) values are arch independent.
They are defined in include/asm-<arch>/kdebug.h.

Your idea is good, but I think it has very large impact. It is very hard to fix
them at the same time. So, how about putting off merging two lists?

 > I think Bernhard's suggestion looks better here. I noticed that
> /sys/kernel/debug is already present. So how about following.
> 
> /sys/kernel/debug/kdump/priority
> /sys/kernel/debug/kdb/priority
> /sys/kernel/debug/IPMI/priority

Good.

> 
> I think at some point of time we shall have to create another file say
> description.
> 
> /sys/kernel/debug/IPMI/description
> 
> Which can tell what does this tool do? Other a user might not have any
> clue how to prioritize various things.

Good idea. :-)

Thanks
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